James Gunn has confirmed on Twitter that his brother, Sean Gunn, will be doing the motion-capture, on set acting as Rocket Racoon in Avengers: Infinity.
He’s not a stand-in. He’s motion reference. We use Sean’s acting and expressions for Rocket. And yes he’s doing that. https://t.co/CAt97WUm4m
— James Gunn (@JamesGunn) February 11, 2017
Sean Gunn had already teased he was appearing in the film, but until now it wasn’t clear if he’d be playing Rocket or his live-action Ravager character, Kraglin.
Just last month, Marvel began official production on Infinity War, which is filming in Atlanta, GA.